NIST Cerberus - An IPsec reference implementation for Linux.
OpenBSD VPN Mini-FAQ - IPSec VPN configuration information.
Point to Point Protocol Extensions Working Group (PPPEXT ) - An IETF group working on PPP's extensions.
Point to Point Tunneling Protocol - PPTP technical specification by 3Com.
PoPToP - PPTP server solution for Linux. Includes downloads, documentation and news.
PPTP Client - A Linux, FreeBSD and NetBSD client for the Microsoft Point-to-Point Tunneling Protocol.
PPTP Crack - Counterpane Systems has exposed insecurities in Microsoft's Point to Point Tunneling Protocol.
Stunnel - A GNU program allowing to encrypt arbitrary TCP connections inside Secure Sockets Layer (SSL).
VPN-Protocols - Technologies used for creating secure VPNs. Various standards and protocols listed with links to related RFCs.
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